matriz = [[1, 2, 3, 4],
          [5, 6, 7, 8],
          [9, 10, 11, 12]]

for i in range(3):
    for j in range(4):
        print(matriz[i][j], end='\t')
        #print('{0:2}'.format(matriz[i][j]),
        #      end=' ')
    print()
          
